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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Ternary graphene-CoFe2O4/CdS nanohybrids: preparation and application as recyclable photocatalysts
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Ternary graphene-CoFe2O4/CdS nanohybrids: preparation and application as recyclable photocatalysts

机译：三元石墨烯-CoFe2O4 / CdS纳米杂化物：制备及作为可回收光催化剂的应用

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摘要

Graphene (Gr)-based binary Gr-CoFe2O4 and Gr-CdS or ternary Gr-CoFe2O4/CdS nanohybrids were prepared via a facile solvothermal strategy. It was encouraging to find that the ternary Gr-CoFe2O4/CdS nanohybrids exhibited the highest photocatatytic degradation ability (80%) among all the photocatalysts. The significant enhancement in photodegradation under 40 W daylight lamp irradiation was attributed to graphene acting as a "bridge", where electrons generated from CoFe2O4 were transferred to CdS by graphene and finally led to separation of electrons and holes. Interestingly, neat CoFe2O4 resulted in increasing concentration of methylene blue (MB) as the irradiation time increased. The phenomenon was ascribed to adsorption of MB molecules on CoFe2O4 in the dark and desorption from the photocatalyst during irradiation, confirmed by our ingenious experiment. Digital photos of the Gr-CoFe2O4/CdS hybrids in an external magnetic field indicated that the ternary photocatalyst could be easily separated from aqueous solution. The recycle measurements of the photocatalyst revealed that the ternary nanohybrids exhibited acceptable photocatalytic stability due to unstable decoration. This work would provide a new insight into the construction of visible light-responsive and magnetic separable photocatalysts with high performances.
机译：石墨烯（Gr）的二元Gr-CoFe2O4和Gr-CdS或三元Gr-CoFe2O4 / CdS纳米杂化物是通过一种容易的溶剂热策略制备的。令人鼓舞的是，在所有光催化剂中，三元的Gr-CoFe2O4 / CdS纳米杂化物表现出最高的光催化降解能力（80％）。在40 W日光灯照射下光降解的显着增强归因于石墨烯充当“桥”，其中CoFe2O4产生的电子被石墨烯转移至CdS，并最终导致电子与空穴的分离。有趣的是，随着辐照时间的增加，纯净的CoFe2O4导致亚甲基蓝（MB）浓度的增加。这种现象归因于MB分子在黑暗中在CoFe2O4上的吸附以及在辐照过程中从光催化剂上的脱附，这已被我们的巧妙实验所证实。在外部磁场中Gr-CoFe2O4 / CdS杂化物的数码照片表明，三元光催化剂可以很容易地从水溶液中分离出来。光催化剂的循环测量表明，由于装饰不稳定，三元纳米杂化物表现出可接受的光催化稳定性。这项工作将为构建高性能的可见光响应型和磁性可分离光催化剂提供新的见解。

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